JPS5468196

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DESCRIPTION JPS5468196
Description 1, title of the invention
Electronic buzzer
8. Detailed description of the invention The present invention relates to a drive coil (11, an iron
core (2) excited by the drive coil (1), and a part fixed to one end of a macnet (3) In an electronic
buzzer having a diaphragm (4) partly opposed to the iron core (2) end face, the through hole 5)
for inserting the iron core (2) at the center has 鍔 EndPage: A projecting portion QO in which the
base end of the terminal strip (9) is embedded is integrally formed on one collar portion (6) of
the coil frame (8) having 1 @ (6) (7) and a notch reaching the projecting portion αQ The lead
wire (la) (1) (1 b) (1 c) of the drive coil (1) is formed in the collar portion (6) and wound around
the coil frame (8) to lead out in the notch (ii) Connected to the terminal piece (9), and the
projection αQ is inserted into the mounting hole (most) of the board such as the yoke plate
□□□. And a through hole (5) for inserting an iron core (2) in the center as one of the specific
inventions, and one coil frame (8) having a coil # (61 L7) at the upper and lower ends Form
integrally a projecting portion in which the base end of the terminal strip (9) is embedded in 5
(6) and form a notch (0) which reaches this projecting #QI) in the above part (6), and the coil
frame (8) Draw out 'l fi (la) (lb) (lc) of the drive coil (1) which has been wound 7 is led out along
the notch (6) and connected to the terminal strip (9), and the yoke plate (2) Insert the projecting
part Q0 of the coil frame (8) into the provided mounting hole (d) and squeeze the lower end of
the iron core (2) through the through hole (5) of the coil frame (8) into the narrow hole Qf9 And
the peripheral portion of the diaphragm (4) at the upper end of the cylindrical magnet (3) whose
lower end is joined to the peripheral edge of the yoke plate @. The electronic buzzer according to
the second aspect of the present invention is characterized in that the center of this vibration &
(4) is disposed opposite to the upper end face of the iron core (2) via a gap. The place is to
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provide an electronic buzzer having high productivity and high reliability. Conventionally, as
shown in FIGS. 18 and 14, since the pre-formed yoke coil (1) is directly bonded to the yoke plate
(6), between the yoke plate @ and the drive coil (1) There is a risk of causing a short circuit,
moreover, the drive coil (1, pull out! Since 74 (la) (lb) (lc) was pulled out through the (1 J
repitation a force of the yoke plate (2), there is a high possibility of breakage of the lead (la) (lb)
(lc) at this pulled out portion There is a problem, and the drive coil (1) is produced, stored and
transported by a single coil from a process point of view, and thus there is a problem that defects
such as fraying and breakage of the coil increase.
The present invention has been provided in view of the above-described points, and one
embodiment of the present invention will be described in detail with reference to the drawings.
(8) is a drive coil (a coil frame made of synthetic resin wound around a core, and an iron core
penetrating vertically in the center (a through hole jj through hole is formed, and both upper and
lower ends are formed The weir 5 (61 (v) is integrally formed. The lower collar portion (6) is
provided with a substantially cylindrical protrusion aO projecting downward integrally with the
lower collar portion (6), and a base end of the terminal piece (9) is embedded in the protrusion
sun. The side surfaces of the portion (6) and the projecting portion Q1 are notches (6) or t
extending from the inside of the collar portion (6) to the projecting proximal end of the terminal
piece (9). The lead wires (1a, 1b, 1C) drawn from the middle point and both ends of the drive coil
(1) are respectively wound around the corresponding terminal pieces (9) ... Attached is
connected. J: When forming the coil block on the upper surface of the yoke plate as described
above, form the mounting hole 0 and the joint hole 0 in the yoke plate 4 and project the coil
frame (8) The iron frame 5 with the head m <2m> provided at the upper end by inserting the
portions OQ into the corresponding mounting holes (), and projecting the terminal piece (9)
downward from the lower surface of the yoke plate The lower end of the iron core (2) is
squeezed by passing through the through hole (5) of (8) and the hole is tightened (fixed to IQ).
After fixing the coil block on the yoke plate Q) as described above, the lower end of the
circumferential magnet (3) is fixed on the upper surface of the periphery of the yoke plate (2).
The lower surface of the central portion on which the magnetic plate α 呻 of the diaphragm (4)
whose peripheral edge is fixed to the upper end notch step portion (t) is fixed is paired with the
upper surface of the head (2a) of the iron core (2) with a gap. After that, for example, the yoke
plate 4 is placed on the printed board Q4, and the terminal piece (9) protruding from the lower
face of the yoke board 4 is adhered to the lower face of the printed board (B) by soldering. The
case (2) is mounted so that the peripheral surface of the yoke plate (2) is press-fitted, and the
case (2) is fixed to the printed circuit board Q4 with screws (2). The driving coil (1) is driven by a
blocking oscillation circuit as shown in FIG. 5, for example, to make a buzzer sound. FIG. 6 shows
another embodiment of the present invention, in which a press-in recess provided on the inner
peripheral surface of the case (c) is provided with a press-fit piece protruding upward from the
key point of the peripheral edge of the yoke plate The case (goods) is fixedly attached to the
outer periphery of the sound producing block made of the yoke board Korea and the magnet (3)
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by press-fitting the above-mentioned press-fit piece @ (2) into a place (ha) For this reason, the
sounding body block is strongly hooked to the case @, and the press-fit of the sounding body
block to the case (2) becomes EndPage: 2 so that the upper end of the magnet (3) can be pressed
by the inner surface of the case QB. As a result, it is possible to eliminate the adhesion between
the yoke plate (2) and the magnet (3).
The sixth figure 91. In the example, the head (2 m) lower surface of the iron core (2) is an
inclined surface and the iron core of 2 (When the sword is strung and fixed to the yoke
temporary, coil frame (8) is sufficiently tightened, The upper end edge of the through hole (5)
passing through the iron core (2) can be laterally spread by the inclined surface of the lower
surface of the head (21) to prevent the coil frame (8) from rattling it can. In this case, as shown
in FIG. 8 (a) (b) to FIG. 9, when the projecting rib (2) in the inclined direction is provided on the
inclined surface of the lower surface of the shaving # (2 a) Then, the rotation of the coil frame (8)
with respect to the iron core (2) is prevented. FIG. 10 shows still another embodiment of the
present invention, in which a recessed step (2) is formed on the lower outer periphery of the
magnet (3) and the outer peripheral surface of the yoke plate (2) is surrounded by this recessed
step (e). The magnets (phrase and yoke temporary) are arranged by aligning them to the surface
and arranging them over the recessed step (e) circumferential surface and the yoke plate (d)
outer peripheral surface to thermally shrink the heat-shrinkable tube (roll). The sounding body
blocks are fixed in the same manner as in the above embodiment. FIGS. 11 and 12 show still
another embodiment of the present invention, in which the projection mQQ of the coil frame (8)
is protruded to further project the lower part integrally with the heat attachment boss to the nine
flanges (6). It is In this embodiment, however, the sounding body block is provided with the
thermal attachment boss (d) penetrating through the through hole (e) of the yoke plate (6) and
the through hole of the printed board a4. The terminal strip (9) is soldered on the lower surface
of the printed circuit board Q4, and the printed circuit board (on the lower surface of the lower
surface 14 is attached to the heat-attaching boss) is thermally attached to fix the sound
producing block on the printed circuit board Q4. As described above, according to the present
invention, the base end of the terminal strip is embedded in one flange portion of the coil frame
having a through hole for iron core insertion at the center and flanges at the upper and lower
ends and integrally forming the nine projecting portions At the same time, a notch reaching the
projection is formed in the flange portion, and the lead wire of the drive coil is wound around the
coil frame and led out along the notch and connected to the terminal piece, and the projection is
a substrate such as a yoke plate Mounting. Since the drive coil is inserted into the hole, the drive
coil does not short-circuit with the yoke plate or other members, nor does the drive coil fray or
break during the process. Moreover, since it is not necessary to form a coil block as a single unit
as in the conventional example, the drive coil does not need to be formed of a fusion wire, and
the number of processing steps for the lead wire of the drive coil can be greatly reduced. It has
the effect of being able to reliably prevent a wire breakage accident and to obtain a large
improvement in productivity.
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Furthermore, in the second invention, the projection of the coil frame is inserted into the
mounting hole provided in the yoke plate, and the lower end of the iron core penetrating through
the through hole of the coil frame is squeezed and fixed in the throttling hole. The drive coil is
wound, and fixing of the coil block formed of the t coil frame to the yoke plate becomes amp, and
disconnection of the lead wire does not occur due to rattling of the coil block with respect to the
yoke plate. The peripheral edge of the diaphragm is joined to the upper end of the cylindrical
magnet whose lower end is joined to the peripheral end of the yoke plate, and the center of the
vibration 111J is opposed to the upper end face of the iron core with a gap in between. Because
of this, the electronic buzzer can be assembled in a simple process. 4. Simple tax-subtracted
drawing Figure 1 is a cross-section of zero-drawing-embodiment of the embodiment, 2 is a
magnified perspective view of the lower part of the coil coil of the same embodiment omitted, 8
is the pronunciation of the same cause Fig. 4 is an enlarged bottom view of the sound generator
block, Fig. 4 is a circuit diagram of the IJlj circuit of the drive coil, and Fig. 6 is a sectional view of
another embodiment of the present invention. , 71% (a) Vi is a perspective view of the sound
generating body flock, FIG. 7 (b) is an enlarged perspective view of the main part of the inner
surface of the case, and FIG. 8 (a) (b) is an iron core of the same. Fig. 9 is a cross-sectional view of
the main part of the sound producing block same as the above, Fig. 10 is a cross-sectional view of
still another embodiment of the present invention, and Fig. 11 is another embodiment different
from the present FIG. 12 is a cross-sectional view of the above-mentioned sound generator block,
FIG. 18 is an enlarged cross-sectional view of the conventional sound generator block, and FIG. Is
an enlarged bottom view of the above, (1) is a drive coil, (1a) (1b) (IC) # i each lead wire, (2) iron
EndPage: 3 core 1 (3 is a magnet, a Diaphragm, (5) through-hole, (6) (7) each buttocks, (8) Fi Micoil, (91 Fi terminal piece, Qo a protrusion, 0 break, (6) a yoke plate, Q The mounting hole 04 is a
printed circuit board, (2) is a thermal attachment boss, and 0 呻 is a narrow hole. Attorney Patent
Attorney 61) Shoji EndPage: 4
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